From Twin Peaks via How to Drink

1 oz. Sarsaparilla Syrup

1.5 oz. Bourbon

2.5 oz. Toasted Porter

Violet Liqueur Foam - in iSi + 2 charges. Scale down

7 oz. Créme De Violet

.07 "Foam Magic"

Sarsaparilla Syrup by weight

1.4 oz. Sassafras Root

.5 oz. sarsaparilla root

.35 oz. licorice root

.2 oz. cinnamon stick

.04 oz. Gentian Root 

450 g. demerara Sugar

32.26 oz. water boil till sugar dissolved let sit 10-20